.contain {
    width: 80%;
    margin: 0 auto;
}

.contain h2 {
    font-size: 36px;
    font-weight: 600;
    color: #333;
    font-family: '宋体';
    text-align: center;
    margin-top: 50px;
}

.contain .main {
    columns: 4;
    -moz-columns: 4;
    /* Firefox */
    -webkit-columns: 4;
    /* Safari 和 Chrome */
    -moz-column-gap: 30px;
    /* Firefox */
    -webkit-column-gap: 30px;
    /* Safari and Chrome */
    column-gap: 30px;
    padding-bottom: 80px;
    border-bottom: 2px solid #999;
}

.clos {
    display: inline-block;
    border: 1px solid #c3c3c3;
    padding: 10px;
    border-radius: 4px;
    box-shadow: 2px -2px 5px rgba(0, 0, 0, .3);
    margin-top: 40px;
}

@media screen and (max-width: 1000px) {
    .contain h2 {
        font-size: 24px;
        margin-top: 20px;
    }
    .contain {
        width: 98%;
    }
    .contain .main {
        columns: 2;
        -moz-columns: 2;
        /* Firefox */
        -webkit-columns: 2;
        /* Safari 和 Chrome */
        -moz-column-gap: 10px;
        /* Firefox */
        -webkit-column-gap: 10px;
        /* Safari and Chrome */
        column-gap: 10px;
    }
    .clos {
        margin-top: 10px
    }
}

.clos a {
    text-decoration: none;
}

.clos a img {
    width: 100%;
    display: block;
    border-bottom: 1px solid #999;
    padding-bottom: 20px;
}

.clos a h3 {
    font-size: 18px;
    color: #666;
    margin-top: 18px;
    padding: 0 10px;
    text-align: justify;
}

.clos a .on {
    color: green;
    font-size: 24px;
    padding-left: 10px;
    font-weight: 600;
}

.clos a .off {
    color: red;
    font-size: 24px;
    padding-left: 10px;
    font-weight: 600;
}